Ngokweenkqubo ezahlukeneyo zemveliso, inokohlulwa ibe inaliti yokusonta evakeleyo kunye nenaliti evuthelweyo;Ngokutsho kwezixhobo ezahlukeneyo kunye neefomyula, zinokwahlulwa zibe: uhlobo oluqhelekileyo (STD), uhlobo lococeko oluphezulu (HP), uhlobo oluphezulu lwe-aluminium (HA), uhlobo lwe-aluminium ye-zirconium, uhlobo oluqhelekileyo ...
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